On Thu, 15 Feb 2007, Michael Lara wrote:
Hi Ingo and Jean-Michel,
Thank you both for your replies! My system is still stuck in pre-udev
pre-history, so I will have to wait until I can try out the udev rules trick.
What kernel is it running? Pre udev was hotplug which did the same thing.
Ie, you should be able to cobble together a hotplug script which unloads
the old driver of the onboard card when you plug in the usb card, then,
when that is unloaded, load the usb driver as the default and finally (or
not) load the onboard driver. On unplugging, unload both drivers, and then
reload the onboard on as default.
All the best
Michael
On Thu, Feb 15, 2007 at 10:50:36AM +0100, Ingo Müller wrote:
Hi!
On the alsa-devel mailing list, there was a thread recently about how to
use udev to distribute card indexes. Maybe this could help you.
http://thread.gmane.org/gmane.linux.alsa.devel/44498
Regards, Ingo
Michael Lara schrieb:
Hello,
Is it possible to define the removable card as the default in a system with
a permanent, internal card and a removable (ie, USB) one? I know about
passing 'index=i' to the driver modules, but I am having a hard time
figuring out how to use that mechanism when one of the cards is removable. I
would like to use the following simple rule:
If the removable (usb) card is connected to the system, make it the default.
Otherwise, use the internal card.
The trouble is that, once the corresponding driver modules have been loaded
with a given index number:
/sbin/modprobe snd-usb-audio index=0 [for the removable card]
/sbin/modprobe snd-intel8x0 index=1 [for the internal card]
With this setup, aplay fails to produce sound when the removable card is not
present since default is not set (there is no card with index 0).
Can I somehow tell alsa (in /etc/asound.conf) that the card with the *lowest
index* (ie, not necessarily the one with index=0) should be used as 'default'?
Thanks in advance for any help
Michael
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